Sorry but we sold out again. However we have more coming. You can select "Notify Me" and we'll let you know as soon as they are back in stock.
Make an extremely compact and portable scope. Primary mirror is 76mm with a focal length of 138mm and the corrector plate mirror is 78mm diameter and -4000mm focal length. We believe that generates an f/20, 1520mm (60 inches) focal length scope with a tube length of about just 6 inches
Provides a sealed optical system.. Eliminates the spider needed in standard reflector scope
Maksutov-Cassegrain telescopes are a catadioptric design, meaning they use both lenses and mirrors. Mak-Casses are primarily reflecting telescopes, but they use a corrector lens to eliminate aberrations that would result from the mirror design alone. In a Mak-Cass the incoming light passes through the Maksutov corrector lens (sometimes called a meniscus corrector, because of its shape) at the front of telescope. It is reflected from a concave primary mirror at the back of the scope which focuses the light to the front of the telescope where it is reflected again by a smaller, convex secondary mirror. Finally, the light travels back through a hole in the primary mirror to the rear of the scope where an eyepiece is located for visual observing (or a camera for photographing). By folding the light in this manner, a Mak-Cass can be made much smaller than an equivalent Newtonian or refractor. Unused.
Charles O'Donnell has created a great 3D print telescope assembly for this lens: Go Now
